Open AccessSupermode noise suppression with mutual injection locking for coupled optoelectronic oscillator
Author(s) -
Jian Dai,
Anni Liu,
Jingliang Liu,
Zhen Tian,
Yue Zhou,
Feifei Yin,
Yitang Dai,
Yuanan Liu,
Kun Xu
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.027060
Subject(s) - injection locking , phase noise , dbc , physics , oscillation (cell signaling) , local oscillator , optics , offset (computer science) , microwave , noise (video) , signal (programming language) , optoelectronics , computer science , laser , quantum mechanics , artificial intelligence , biology , image (mathematics) , genetics , programming language
The coupled optoelectronic oscillator (COEO) is typically used to generate high frequency spectrally pure microwave signal with serious sidemodes noise. We propose and experimentally demonstrate a simple scheme for supermode suppression with mutual injection locking between the COEO (master oscillator with multi-modes oscillation) and the embedded free-running oscillator (slave oscillator with single-mode oscillation). The master and slave oscillators share the same electrical feedback path, which means that the mutually injection-locked COEO brings no additional hardware complexity. Owing to the mode matching and mutually injection locking effect, 9.999 GHz signal has been successfully obtained by the mutually injection-locked COEO with the phase noise about -117 dBc/Hz at 10 kHz offset frequency. Besides, the supermode noise can be significantly suppressed more than 50 dB to below -120 dBc.